Collection tube assembly



FIG. 1 is a top and front perspective view of a collection tube assembly with a transparent top portion and an opaque bottom portion;

FIG. 2 is a top plan view of the collection tube assembly of FIG. 1;

FIG. 3 is a bottom plan view of the collection tube assembly of FIG. 1; and,

FIG. 4 is a side elevational view of the collection tube assembly of FIG. 1 the opposite side elevational being identical thereto. 

The ornamental design for a collection tube assembly, as shown and described. 